REGEX Date Validation with 3-Week Fallback

This n8n workflow demonstrates practical REGEX usage in an IF node to validate a 'Close Date' field. Starting with a Manual Trigger, it sets an initial date value. The core IF node tests if the Close Date matches the pattern /\d\d\d\d-\d\d-\d\d/i (case-insensitive YYYY-MM-DD). If matched, it routes to 'Set Close Date To Original', preserving the value. If not, it generates a fallback date three weeks ahead using JavaScript's Date API: new Date(new Date().setDate(new Date().getDate() + 21)).toISOString(). The flow ends at a NoOp node for output viewing.

Benefits include robust date validation preventing invalid data propagation, automated fallback for missing/invalid dates, and easy testing via toggling the initial Set node. It's lightweight, using only core n8n nodes, making it efficient and customizable.

Use cases span education (e.g., student enrollment deadlines), CRM (opportunity close dates), project management (task due dates), or any scenario needing conditional date logic. Adapt for production by swapping Manual Trigger for webhooks/APIs and integrating with tools like Google Sheets or databases.